package com.cms.juc;

import java.util.concurrent.CountDownLatch;

/**
 * 倒数技术
 */
public class CountDownLatchDemo {

    public static void main(String[] args) throws InterruptedException {
//        for (int i = 0; i < 6; i++) {
//            new Thread(() -> {
//                System.out.println(Thread.currentThread().getName() + "离开教室");
//            }, String.valueOf(i)).start();
//        }
//        System.out.println(Thread.currentThread().getName() + "锁门");
        CountDownLatch countDownLatch = new CountDownLatch(6);
        for (int i = 0; i < 6; i++) {
            new Thread(() -> {
                System.out.println(Thread.currentThread().getName() + "离开教室");
                countDownLatch.countDown();
            }, String.valueOf(i)).start();
        }
        countDownLatch.await();
        System.out.println(Thread.currentThread().getName() + "锁门");

    }

}
